my_list = []
my_list.append(1)
my_list.append("aa")

from collections import abc

a = [1,2]
c = a + [3,4]
print(c)

# # 就地加
# a += (3,4)
# print(a)
#
# a.extend(range(3))

a.append([3,4])
a.append((5, 6))
print(a)

